l3docstrip – Strip documentation in LaTeX 3 source

The pack­age pro­vides, for the LaTeX 3 dis­tri­bu­tion, the same
func­tion as does doc­strip for LaTeX
2e code — to re­move com­ments from a source file, to pro­vide a
faster-run­ning (and more com­pact) ver­sion of the .dtx source.